Juiced ball theory

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The "juiced ball" theory suggests that the baseballs used in Major League Baseball (MLB) have been deliberately altered by the league in order to increase scoring. The theory first came to prominence in the 1990s to early 2000s, but the theory receded once it became clear that the more likely explanation for the increase in scoring during that time was an increase in steroid use, as documented in the Mitchell Report in 2007. The juiced ball theory made a resurgence in the late 2010s, as a noticeable uptick in offensive output, especially home runs, was observed.